Multiple Myeloma
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Overview

What is multiple myeloma?

Multiple myeloma (say: my-a-low-ma) is a kind of cancer in the bone marrow. Bone marrow is the tissue inside the bones where new blood cells are made. Multiple myeloma is caused when your body makes too many of a certain blood cell, called a plasma cell. When this happens, the abnormal plasma cells group together and form tumors. They kill the bone cells around them and keep other blood cells that your body needs from being made.